Measurement using a calibration pattern

1. A method for making a measurement comprising:

(a) capturing a digital image, the captured digital image including a calibration pattern, the calibration pattern being square in shape, the calibration pattern including displayed encoded information arranged in a two dimensional pattern, the displayed encoded information directly providing calibration information about the calibration pattern that can be used directly in a calibration process;

(b) reading the displayed encoded information to obtain the calibration information about the calibration pattern, where said displayed encoded information includes (1) a first square non-solid box at a first corner of said calibration pattern with a first solid box located within said first square non-solid box, (2) a second square non-solid box at a second corner of said calibration pattern with a second solid box located within said second square non-solid box, (3) a third square non-solid box at a third corner of said calibration pattern with a third solid box located within said third square non-solid box, where said displayed encoded information arranged in said two dimensional pattern relates to a size calibration information of said calibration target, where said displayed encoded information arranged in said two dimensional pattern also relates to a geometrical calibration information of said calibration pattern based upon said first, second, and third square non-solid boxes; and,

(c) utilizing said size calibration information and said geometrical calibration information about the calibration pattern to make a calibrated measurement.

2. A method as in claim 1 wherein the calibration pattern is a two-dimensional bar code and the displayed encoded information is encoded within the two-dimensional bar code.

3. A method as in claim 1 wherein the displayed encoded information also includes an identifying indicia for the calibration pattern, the identifying indicia being useful for obtaining information about the calibration pattern accessible using the identifying indicia.

4. A method as in claim 1 wherein the displayed encoded information also includes an encoded identification indicia within a two-dimensional bar code within the calibration pattern.

5. A method as in claim 1 wherein the calibration pattern is included on a case for the mobile device.

6. A method as in claim 1 wherein the calibration pattern is within an indention on a case for the mobile device.

7. A method as in claim 1 wherein the calibration pattern is included on a case for the mobile device, the case including an appurtenance that allows the case to be mounted on a focus plane when the image is captured.

8. A method as in claim 1 additionally comprising:

using an identifying indicia within the displayed encoded information as a pass code to determine user rights to make the calibrated measurement.